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An Improved Method For Preparing Gravimetric Standard Gas Mixtures of Helium-4 in Nitrogen
  • Published Date:
    1/1/1990
Filetype[PDF - 423.15 KB]


Details:
  • Description:
    An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen has been developed by the U.S. Bureau of Mines. A single-pan 12-kg analytical balance that has a sensitivity of 3 mg is used to prepare the mixture. The balance will accommodate a cylinder having a volume of approximately 4 L that weighs approximately 5 kg. The method has been improved to a precision of ±O.04 pct by performing four successive dilutions, by improved handling of gases in the manifold, and by using an improved analytical method to select high-purity gases.

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